Situated in a quiet but central spot in Oslo, the KNA is a very suitable hotel for exploring Oslo. The KNA offers fairly standard, if a tad small, European-style rooms for a decent price. The rooms were nice and neat, and the service was great. Other offerings at the hotel include a pretty nice little gym and sauna, as well as a quite tasty restaurant and bar off the main lobby.
The best part is the location, just a few blocks from the Aker Brygge, a few from the embassy area, and a few from the royal palace. It's also only a few steps from mass transit, making it easy to hit other parts of town.